XAML By Hand!?
Adam Nathan responds to Mike at Median Group (an awesome designer that I had the pleasure to work with for two years on the NxOpinion project) about tools to help create XAML. In addition to the three tools that Adam mentions, I'd also add Mobiform's Aurora product which currently runs on the March CTP.
On a related note, what other design tools should export to XAML? Do we have any designers in the audience who can provide feedback?